Array linear between seclected two points.
 
  File name : ARD.LSP

When you use Array command of AutoCAD, you must enter x number, y number, x distance, y distance. 
It's kinda uncomfortable. You need to enter just range and distance between rebars.
This program array only vertical or horizontal.
If you want to array inclined, use ARSLOP.LSP
 
     Example               
Select objects: {p1} 1 found           [Select entity to be arrayed]
Select objects:                        [Finish selecting]
Pick start point: _cen of {p2}        [Pick start point]
Pick end point: {p3}                    [Pick end point] Program recognize x distance and y distance. 
                              and determine x or y direction as a final array direction
Distance = 4575.84                     [Program shows user distance 
Array distance: 600                    [Enter array distance ]
Remainder = 375.836                    [Program shows remained distance after array]